Furnace



Sept. l5, l931.

Filed T. E, MURRAY ET All.

LSEN' FURNACE Nov. 5,1925

Patented Sept. 15, 1931 UNITED sTATEs PATENT OFFICE THOMAS E. MURRAY,BROOKLYN; AND JOHN H. LAWRENCE,

SAID LAWRENCE ASSIGNOR TO SAID MURRAY; JOSEPH BRADLEY MURRAY, THOMAS E.MURRAY, J'R., AN'D JOHN' F. MURRAY, EXECUTORS OF SAID THOMAS E. MURRAY,

DECEASED, ASSIGNORS TO METROPOLITAN ENGINEERING COMPANY, A CORPORA- 'nonor NEW YORK FURNACE Application led November 3, 1925.

Our invention aims to provide certain improvements in furnaces burningpulverized coal, oil, gas or other jet fuel whereby a desirabledistribution of the burning gases can be secured and other advantagesobtained. The accompanying drawings illustrate an embodiment of theinvention.

Fig. 1 is a perspective view of a boilerfurnace to which the inventionis applied.

Fig. 2 is an enlarged sectional view of one of the nozzles.

Fig. 3 is a horizontal sectional view of a furnace.

In Fig. 1, we have illustrated in dotted lines at 1 a set ofconventional boiler tubes supported above the combustion chamber of thefurnace, to which fuel is supplied through burner nozzles 2a and 3a onone side, similar nozzles 2b and 3b on the adjacent side and otherssimilarly arranged on the remaining sid-es. The drawings show what webelieve to be the best arrangement. But the invention may be utilizedwith various other arrangements, locations and groupings of nozzles.

The invention may be applied to ordinary furnaces with walls ofrefractory brick or to furnaces with various other types of wall. It isparticularly useful in connection with furnaces the walls of which arecomposed of or lined with water tubes, this being a construction whichis fully described in several pending applications of Thomas E. Murrayand which is illustrated in Fig. 3. According to this figure the wallsare composed of vertical water tubes 4 in parallel rows surrounded by anouter shell 5.

Each jet of gas directed along a side wall is vdeflected at anintermediate point along the width of such wall by a second jet in atransverse direction. As shown in Fig. 3,

for example, the jet from the nozzle 3 traveling across the face of thewall at the lower side of the figure is deflected by the jet from thenozzle 2b located about one-fourth of the width of the wall beyond theend of the nozzle- 3. The same arrangement is repeated at each corner,the jet from 3b being deiected by that from 2, the 'jet from 3c by thatfrom `2d and the jet from 3d by that from 2a. The

Serial No. 66,616.

' entire space is well heated. It is as if the combustion chamber weredivided into four cells in each of which the volume of gases isseparately controllable, and this without the necessity of any wallsbetween the cells.

The several whirling columns may be madev larger or smaller by shiftingthe position of the nozzles 23-2d with respect to the nozzles 3a3d andby altering the velocity of the jets. Where the whirling columns aresmall compared with the area of the combustion chamber, additional jetsmay be introduced near the middle of the walls to supply burning gasesbeyond the effective zones of the whirls in the four corners. Generallythe larger the furnace, the greater the number of jets. While thenozzles SI1-1 are shown parallel to the respective side walls and thenozzles 2a-d at right angles thereto, the former may be turned moretoward the center of the furnace and' the latter also t-urned more orless obliquely.

In Fig. 3 there are illustrated also additional jets introduced near themiddle of the walls and extending well beyond the tubes and into a zonewhere the temperature is very high. In such zones and in fact whereververy high temperature conditions are to be met, it is advisableto usewater cooled nozzles as indicated in Fig. 2. Here an outer tube 6 passesthrough the shell 5 and the tubes 4 of the wall. The tube 7 of thenozzle, carrying a mixture of air and fuel, passes through the closedends of the outer tube 6.`

rious other arrangements may be adopted for cooling jackets around thenozzles.

The provision of a cooling jacket for fuel nozzles is not claimed in thepresent application.

The directing of a secondjet of fuel transversely against the first hascertain important advantages independently of the production of whirlingcolumns of burning fuel. The jet from the nozzle 3a, for example,strikes that from the nozzle 2* near the end of the latter and deflectsit and retards its movement forward. The result is to cause a morethorough mixing of the fuel with air at the point where the fuel emergesfrom the nozzle 2b and thus to accelerate combustion at this initialpoint of the jet.

In the ordinary arrangement of nozzles, the fuel is projected to aconsiderable distance from the nozzle at such a. high velocity thatthere is little or no combustion for a substantial distance. Thetransverse jet (from the nozzle 3a, for example,) causes a deflection,mixing and extra heating of the fuel (from the nozzle 2b), so as toreduce the distance which the fuel travels before it is efficientlyignited.

The result of such a combination of nozzles, therefore, is to secure aquicker complete ignition and a more-complete combustion of the fuel inthe combustion chamber.

Various modifications of the embodiments disclosed may be made by thoseskilled in the art without departing from the invention as defined inthe following claims.

What we claim is:

1. A furnace fired with jet fuel having a nozzle arranged to direct ajet substantially along a wall of the combustion chamber and a secondnozzle arranged todirect a second jet transversely against the first,the said arrangement being repeated at intervals around the furnace soas toproduce in the combustion chamber a plurality of whirling columnsof burning fuel.

2. A rectangular furnace fired with jet fuel having in each corner ofthe combustion chamber a nozzle arranged to direct a jet Substantiallyalong a wall of said chamber and a second nozzle arranged to direct asecond jet transversely against the first so as to provide separatewhirling columns of' burning l fuel inthe several corners of thefurnace.

3. A furnace the sides; of the combustion 4. A. urnace structureasdefined in claim 1 in which additional nozzles are arranged to projectfuel into the spaces between the whirling columns.

5. A boiler furnace fired with jet fuel having a nozzle arranged todirect a jet of fuel into the combustion chamber, a second nozzlearranged to direct a second jet of fuel transversely against the firstnear the end of the first nozzle so as to defiect the first jet andaccelerate the mixing of the fuel with air and its ignition at a pointclose to its origin, the walls of the combustion chamber in theimmediate vicinity of the two jets being composed ofsteam generatingwater tubes.

6. A boiler furnacefired with jet fuel having adjacent walls extendingin different directions and having a nozzle passing through one wall andarranged to direct a jet of fuel along the second wall, and a secondnozzle passing through the second wall and arranged to direct a jet offuel transversely against the first jet near the end of the first nozzleso as to defiect the first jet and accelerate the mixing of the fuelwith air and its ignition at a point close to its origin, both wallsbeing composed of steam generating water tubes.

In witness whereof, we have hereunto signed our names.

THOMAS E. MURRAY. JOHN H. LAWRENCE.

